Heat radiator and electronic apparatus

ABSTRACT

A heat radiator has two or more heat radiation fins arranged at intervals, and conducts heat from the heat radiation fins to air that flows in space of the heat radiation fins. The heat radiation fins have notches formed such that central parts of edges of the heat radiation fins in at least one of the air inflow side and the air outflow side of the heat radiation fins are cut alternately or on a circulating basis in an array direction of the heat radiation fins.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a heat radiator having two or more heat radiation fins arranged at intervals, which radiate heat to air that flows in space of the heat radiation fins, from the heat radiation fins, and an electronic apparatus which is equipped with an electric circuit to perform the heat radiation by the heat radiator.

2. Description of the Related Art

The calorific value from large-scale LSI increases as large-scale LSI that has a high arithmetic capacity in an electronic apparatus is installed along with more and more making of an electronic apparatus in recent years high performance, and the arithmetic capacity improves further. Therefore, the height of the heat radiation performance has been demanded from the heat radiator that bears the heat radiation of the large-scale LSI more and more.

As the heat radiator, there is known the one in which the heat generated from large-scale LSI is conducted to the heat radiator that two or more heat radiation fins open the space and are arranged, air is thrown into the spaces of the heat radiator, and the large-scale LSI is radiated to the air by depriving of the heat of the heat radiator is known. In order to implement a higher heat radiation performance, the proposal to devise shape and the array of the heat radiation fin is performed (For instance, refer to Japanese Patent Application Publication No. 2003-37383).

Here, one big problem in the heat radiator that two or more heat radiation fins like the above-mentioned open the space and are arranged is the points with a large noise.

Then, it is thought to expand the space, and to lower the amount of the wind, but it moves backward with the current state from which more and more improvements of the heat radiation performance are requested, since both bring about heat radiation lower performances.

SUMMARY OF THE INVENTION

The present invention has been made in view of the above circumstances and provides a heat radiator contributing to decreasing noise maintaining the heat radiation performance, and an electronic apparatus which is equipped with the heat radiator.

A heat radiator according to the present invention has two or more heat radiation fins arranged at intervals, which conducts heat from the heat radiation fins to air that flows in space of the heat radiation fins, wherein:

the heat radiation fins have notches formed such that central parts of edges of the heat radiation fins in at least one of the air inflow side and the air outflow side of the heat radiation fins are cut alternately or on a circulating basis in an array direction of the heat radiation fins.

In the heat radiator according to the present invention, among the heat radiation fins arranged at intervals, there are heat radiation fins each having a notch formed in its one edge in at least one of the air inflow side edge and the air outflow side. The notches are formed such that the central parts of the edges of the heat radiation fins are cut alternately or on a circulating basis in an array direction of the heat radiation fins. Therefore, it is possible to make the opening space at the air inflow side and/or the air outflow side larger than a case where heat radiation fins having no such notches are merely arranged at intervals. This makes it possible to reduce collisions between the edges of the fins and air. Since the notches are formed at the edges of the heat radiation fins, the heat radiator of the present invention can suppress nose without lowering the radiation function.

In the heat radiator according to the present invention, it is preferable that the heat radiator has an endothermic board that absorbs heat generated from a heat generation part to be cooled, and a heat transfer member that transfers the heat of the endothermic board to the heat radiation fins by contacting the endothermic board and piercing through the heat radiation fins. It is also preferable that the heat radiator has a fan that forms an air stream in a space between the adjacent heat radiation fins.

When the endothermic board, the heat transfer member, or the fan are provided, it is possible to effectively radiate heat by means of the radiation fins.

In the heat radiator according to the present invention, it is also preferable that the fan is a fan that sends air to the space of the heat radiation fins.

An electronic apparatus according to the present invention includes:

a circuit substrate that is loaded with a processing circuit for executing a program; and

a heat radiator that radiates heat of the processing circuit,

wherein the heat radiator has:

two or more heat radiation fins arranged at intervals, and

an endothermic board that absorbs heat generated from a heat generation part to be cooled, and

the heat radiation fins have notches formed such that central parts of edges of the heat radiation fins in at least one of the air inflow side and the air outflow side of the heat radiation fins are cut alternately or on a circulating basis in an array direction of the heat radiation fins.

Further, the electronic apparatus according to the present invention may have a fan that forms an air stream in a space between the adjacent heat radiation fins, and further the fan may be a fan that sends air to the space of the heat radiation fins.

The electronic apparatus according to the present invention may have: a first case that incorporates the circuit substrate and the heat radiator, the first case having a keyboard on a top of the first case; and a second case connected to the first case via a hinge, the second case being openable and closable with respect to the first case. The second case may be a display device having a display screen that displays a result of processing by the processing circuit.

As described above, the present invention provides a heat radiator contributing to decreasing noise maintaining the heat radiation performance, and an electronic apparatus which is equipped with the heat radiator.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an electronic apparatus according to one embodiment of the present invention.

FIG. 2 is a perspective view of an electronic apparatus according to one embodiment of the present invention.

FIG. 3 is a right side view of the computer shown in FIG. 1 which is in the closed state.

FIG. 4 is a bottom view of the computer according to the present embodiment.

FIG. 5 is a view showing a first panel.

FIG. 6 is a view showing a first panel.

FIG. 7 is a view showing a state wherein a first panel is removed from a main unit.

FIG. 8 is a perspective view of a fin section.

FIG. 9 is a perspective view of a fin section.

FIG. 10 is a perspective view of a fin section.

FIG. 11 is a partially enlarged view of the frame shown in FIG. 7.

FIG. 12 is a partially enlarged view of the frame shown in FIG. 7.

FIG. 13 is a view showing a computer wherein a frame cover of an image display unit is removed.

FIG. 14 is a view showing the inside of a back cover.

FIG. 15 is an enlarged view of a guide frame.

FIG. 16 is an enlarged view of a guide frame.

FIG. 17 is a perspective view of the backside of a frame cover.

FIG. 18 is a partially enlarged view of the backside of a frame cover.

FIG. 19 is a partially enlarged view of the backside of a frame cover.

FIG. 20 is a sectional view taken along the line X-X′ of FIG. 2.

FIG. 21 is a view of a camera unit which is incorporated in an image display unit.

FIG. 22 is a partially enlarged view of the frame cover shown in FIG. 13.

FIG. 23 is a sectional view of the image display unit including a camera unit.

FIG. 24 is a perspective view of a seal member.

DETAILED DESCRIPTION OF THE INVENTION

Embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 and FIG. 2 are each a perspective view of an electronic apparatus according to one embodiment of the present invention.

A computer 1, which is the present embodiment, is a so-called note type of personal computer, in which an image display unit 2 that accommodates an image display device 23 for displaying an image is connected on a free basis in opening and shutting through hinge members 10 with a main unit 3 that incorporates a circuit substrate and disposes a keyboard on the upper surface.

FIG. 1 shows a state in which the image display unit 2 shuts to the main unit 3 and is piled up. FIG. 2 shows a state in which the image display unit 2 is opened for the main unit 3.

The main unit 3 shown in FIG. 1 and FIG. 2 is composed of a keyboard 36 in which two or more keys are arranged, an operation section 37 that consists of a track pad and a click button, an upper cover 31 that is built avoiding part where the keyboard 36 and the operation part 37 are set, a lower cover 32 that forms a case of the main unit 3 together with the upper cover 31, a circuit substrate equipped with CPU that executes a program, the circuit substrate being accommodated in the case, and a shield in which the circuit substrate is installed.

The image display unit 2 shown in FIG. 1 and FIG. 2 is composed of the image display device 23 for displaying an image, a frame cover 21 for covering the periphery of the image display device 23, a back cover 22 (refer to FIG. 1) for forming a case of the image display unit 2 together with the frame cover 21, and a guide frame for guiding wiring of the image display unit 2, the guide frame being accommodated in the back cover 22 and being in contact with the image display device 23. Incidentally, FIG. 1 shows the hinge members 10 through which the image display unit 2 is connected with the main unit 3 on a free basis in opening and shutting. The section X-X′ shown in FIG. 2 will be described later.

FIG. 3 is a right side view of the computer shown in FIG. 1 which is in the closed state.

FIG. 3 shows a state that on a right side of the main unit 3 there are provided slits 32 a for radiating heat generated from CPU loaded in the circuit substrate built into the main unit 3. Fin sections 351, which are the component of a heat radiation unit 35 that will be described later, appear from the slits 32 a.

FIG. 4 is a bottom view of the computer according to the present embodiment.

FIG. 4 shows the lower cover 32 that forms a case of the main unit 3 together with the upper cover 31 (refer to FIG. 2). The lower cover 32 is composed of a first panel 321, a second panel 322, a third panel 323, a fourth panel 324, and a peripheral panel 325. In the following, the first panel is typically taken up among these two or more panels and it explains.

FIG. 5 and FIG. 6 are each a view showing the first panel. FIG. 5 shows the appearance in which the first panel 321 shown in FIG. 4 is seen from the front side. The first panel 321 is provided with slits 321 e for ventilation, and screw holes 321 a, 321 b, 321 c, and 321 d to install the first panel 321 in a frame that will be described later. In the following, for the sake of convenience of the explanation, among the screw holes 321 a, 321 b, 321 c, and 321 d shown in FIG. 5, the screw hole in the vicinity of the center, the screw hole shown in the upper part in FIG. 5 of the screw hole in the vicinity of the center, and the screw hole in the right part in FIG. 5 of the screw hole in the vicinity of the center are referred to as a first screw hole 321 b, a second screw hole 321 c, and a third screw hole 321 d, respectively.

FIG. 6 shows a part of the first panel 321 in the state that the left side of the first panel 321 shown in FIG. 5 is set up, and pushed down right, so that the first panel 321 is turned inside out. The third screw hole 321 d is shown left in FIG. 6, and the first screw hole 321 b is shown in right in FIG. 6.

In FIG. 6, bosses 320 are prepared for in surroundings of these the first screw hole 321 b and the third screw hole 321 d, respectively. Incidentally, the reason why the boss 320 is prepared for in surroundings of the screw hole is described later.

FIG. 7 is a view showing a state wherein the first panel is removed from the main unit.

FIG. 7 shows a shield 33 on which a circuit substrate equipped with CPU is mounted. The shield 33 is provided with a first locking hole 33 b into which a nut which is engaged with a screw on a spiral basis, the screw being inserted through the first screw hole 321 b of the first panel 321 (refer to FIG. 5), is dropped, a second locking hole 33 c into which a nut which is engaged with a screw on a spiral basis, the screw being inserted through the second screw hole 321 c, is dropped, a third locking hole 33 d into which a nut which is engaged with a screw on a spiral basis, the screw being inserted through the third screw hole 321 d, is dropped, and a screw hole 33 e for substrate to install a circuit substrate equipped with an electric circuit in the shield 33. The screw hole 33 e for substrate to install a circuit substrate in the shield 33 is installed at the position that shifts from the first locking hole 33 b.

FIG. 7 further shows a heat radiation unit 35 which is composed of an endothermic board 353, a fin section 351 consisting of two or more radiation fins, a heat transfer member 352 for transferring the heat of the endothermic board 353 through two or more radiation fins to the fin section 351, the heat transfer member 352 being installed in the endothermic board 353, and a fixing arm 354 for fixing the endothermic board 353 on the circuit substrate equipped with CPU so that the endothermic board 353 is touched to the CPU.

FIG. 7 still further shows a fan 34 that sends air to a space formed with the heat radiation fin of the heat radiation unit 35. The air sent from the fan 34 goes out of the slits 32 a shown in FIG. 3 too outside the case depriving of the heat that had conducted to the fin section 351 when passing through the space formed with the heat radiation fin.

Here, there will be explained in detail the fin section 351 of the heat radiation unit 35 prepared for in the computer 1 according to the present embodiment.

FIG. 8 is a perspective view of a fin section.

FIG. 8 shows the fin section 351 penetrated with the heat transfer member 352, which is turned the side where air from the fan 34 flows out to the right of FIG. 8.

The fin section 351 shown in FIG. 8 is one in which first fins 3511 each having a notch 351 a on the center portion of the air outflow side edge, and second fins 3512 each free from notch 351 a, are alternately arranged.

According to the present embodiment, the first fins 3511 and the second fins 3512 are alternately arranged with spaces so as to spread width on the air outflow side. As a result, it is possible to reduce the collision of the edge of the first fins 3511 with air as compared with a case where only the second fins 3512 having no notch 351 a are arranged similarly. Therefore, according to the present embodiment, the preparation of the notches 351 a of the first fins 3511 on the edge portion makes it possible to suppress the noise without so much decreasing the heat radiation function.

Incidentally, according to the present embodiment, the conduction of heat to the fin section 351 is performed through the endothermic board 353 and the heat transfer member 352. However, it is acceptable that the fin section 351 is disposed on CPU as not shown in the figure without the endothermic board 353 and the heat transfer member 352. Alternatively, it is acceptable that neither the first fin 3511 nor the second fin 3512 are alternately arranged, but they are arranged calculatedly in such a way that the first one fin 3511 enters when the second two fins 3512 are consecutive.

FIG. 9 and FIG. 10 are each a perspective view of a fin section.

FIG. 9 shows a heat radiation unit 45 having a fin section 451 wherein same notches 451 a as the notches 351 a explained in FIG. 8, are prepared only at the side where air of the first fin 4511 flows in, which is different from the fin section 351 shown in FIG. 8. In this way, preparation of the notches 451 a only at the side where air flows in also makes it possible to suppress the noise without so much decreasing the heat radiation function.

FIG. 10 shows a heat radiation unit 55 having a fin section 551 wherein same notches 551 a as the notches 351 a explained in FIG. 8, are prepared at both the side where air of the first fin 5511 flows in and the side where the air flows out. In this way, preparation of the notches 551 a at both the side where air flows in and the side where air flows out makes it possible to further suppress the noise without so much decreasing the heat radiation function.

Next, there will be explained the first locking hole 33 b, the second locking hole 33 c, the third locking hole 33 d, and the screw hole 33 e for substrate.

FIG. 11 and FIG. 12 are each a partially enlarged view of the frame shown in FIG. 7.

FIG. 11 shows the appearance in which the first locking hole 33 b, the third locking hole 33 d, and the screw hole 33 e for substrate are prepared for in a thin thickness area 331 where it is dropped in by one step so that the thickness is thinned more than other areas, of the shield 33.

FIG. 12 shows the appearance in which a circuit substrate 36 equipped with CPU (not illustrated) that comes in contact with the endothermic board 353 is screwed to the thin thickness area 331 of the shield 33 through spacers 360. Also here, a position where the circuit substrate 36 is screwed to the shield 33 shifts from a position of the second locking hole 33 c where the first panel 321 is screwed to the shield 33.

FIG. 12 further shows the appearance in which the fixing arm 354 is screwed to the circuit substrate 36 through the spacers 360. Incidentally, the first screw hole 321 b on the back of the first panel 321, and the boss 320 provided on the periphery of the third screw hole 321 d, which are shown in FIG. 6, are for providing an offset for a difference of the groove formed with the thin thickness area 331 of the shield 33 and other areas so that the first panel 321 should not crack when tightening up a screw.

According to the present embodiment, the circuit substrate 36 and the first panel 321 are coupled with one another at positions which are different with respect to the shield 33. Therefore, the impact to the first panel 321 is simply transmitted to the circuit substrate 36 only indirectly through the shield 33. Thus, according to the present embodiment, it is possible to suppress the impact that the circuit substrate 36 receives as compared with the case where the circuit substrate 36 and the first panel 321 are screwed together in the same part with respect to the shield 33.

Further, according to the present embodiment, the thin thickness area 331 thins in its thickness through drop-in by one step from a surrounding area that is adjacent to the thin thickness area 331. Therefore, the thin thickness area 331 of the shield 33 and the surrounding area serve as a damper, and thus it is possible to attenuate with the shield 33 the impact that the first panel 321 receives. As a result, the impact transmitted to the circuit substrate 36 through the shield 33 can be softened further more.

Next, there will be explained the structure of the image display unit 2 in detail.

FIG. 13 is a view showing a computer wherein a frame cover of the image display unit is removed.

FIG. 13 shows the computer 1 wherein the frame cover 21, which covers the front surroundings edge of the image display device 23, is removed, and the frame cover 21. Here, there is shown the appearance in which the whole image display device 23 accommodated by the back cover 22 that forms the case of the image display unit 2 with the frame cover 21 is exposed by detaching the frame cover 21. While the illustration is omitted in FIG. 13, actually, the camera unit, the mike unit, and the wiring etc. attached to these are furthermore disposed to surroundings of the image display device 23. Moreover, though in the frame cover 21 shown in FIG. 13, there is a part where acrylic board 26 is set in part, this is described later.

FIG. 14 is a view showing the inside of the back cover.

FIG. 14 shows the appearance in which the image display device 23 is detached from the image display unit 2 in the state shown in FIG. 13, and the inside of the back cover 22 is exposed. Here, there is shown the appearance in which guide frames 24 that are vertically extended are installed at right and left both ends in the back cover 22, respectively.

The guide frames 24 are installed in the inside of the back cover 22 at intervals from standing walls 221 prepared for in surroundings of the back cover 22. The image display device 23 is set between these two guide frames 24.

FIG. 14 further shows the appearance in which a wiring 100 passes through between the guide frame 24 shown at the right side in FIG. 14 and the standing wall 221 of the back cover 22. Incidentally, actually, the wiring 100 passes through between the guide frame 24 shown at the left side in FIG. 14 and the standing wall 221 of the back cover 22. This is omitted in illustration.

FIG. 15 and FIG. 16 are each an enlarged view of a guide frame.

FIG. 15 shows an enlarged view of the edge shown under FIG. 14, of the guide frame 24 shown left in FIG. 14, and also shows a hinge member 10.

The guide frames 24 is composed of a base section 241 as a base, a convexo-concave touching section 242 which touches the back surroundings edge (back edge part) of the image display device 23 prepared for on the base section 241, and an isolation section 243 for separating the image display device 23 which the touching part 242 touches and the wiring 100, the isolation section 243 being established on the base section 241. The guide frame 24 is formed with an elastomer and fixed to the back cover 22 by a prescribed bonding means. The double-faced tape and the adhesive can be adopted as the bonding means. Incidentally, it is acceptable that the guide frame 24 is composed of another part which is different from the back cover 22 as in the present embodiment; alternatively, it is acceptable that the guide frame 24 is formed in a united body with the back cover 22.

In the image display unit 2, the isolation section 243 of the guide frame 24 separates the image display device 23 and the wiring 100. Thus, according to the image display unit 2, the wiring 100 is prevented from going into the space between the back of the image display device 23 accommodated by the back cover 22 and the back cover 22. Therefore, according to the present embodiment, it is possible to prevent damage of the image display device 23 caused by the effect that the impact onto the back cover 22 is transferred to the image display device 23 through the wiring 100 which goes into the space between the back of the image display device 23 and the back cover 22.

According to the present embodiment, it is possible to absorb the pressure that applies to the image display device 23 when the touching section 242 of the guide frame 24 is shaped as a convexo-concave.

FIG. 15 further shows a wiring restriction section 244 that is one of components of the guide frame 24. The wiring restriction section 244 provides such a restriction that the wiring, which is taken to pass between the isolation section 243 and the standing wall 221 of the back cover 22, should not float. This feature makes it possible to prevent the wiring 100 pushed between the isolation section 243 and the standing wall 221 once from returning to this side, and thus it is possible to contribute to the improvement of the assembly efficiency in the assembly process.

Moreover, FIG. 15 shows the appearance in which a slope 243 a is formed on the point of the part that is adjacent to the touching section 242, of the isolation section 243, and in addition a slope 245 a is formed on the tip of a raising section 245 established at the bottom of the base 241. Incidentally, the slopes 243 a and 245 a are shown in the slash in FIG. 15. While details are described later, slopes which touch the slopes 243 a and 245 a, respectively, are prepared for at the position corresponding to the slope 243 a and 245 a on the other side of the frame cover 21.

FIG. 16 shows the enlarged view of the edge on the other side which is opposite to the edge shown in FIG. 15, of the guide frame 24 shown at the left of FIG. 14.

FIG. 16 also shows the appearance in which the slope 243 a is formed on the point of the isolation section 243 that is adjacent to the touching section 242. In FIG. 16, the slope 243 a is shown in the slash. Incidentally, a slope which touches the slope 243 a is prepared for on the other side of the frame cover 21.

FIG. 17 is a perspective view of the backside of a frame cover.

FIG. 17 shows a part of the frame cover 21 of FIG. 13 in the state that the upper part in FIG. 13 is set up forward and turned over. In the upper part in FIG. 17 there is shown notches 21 b installed to evade the hinge members 10.

Further, FIG. 17 shows first convex sections 212 prepared for on the parts corresponding to the touching sections 242 shown in FIG. 15 and FIG. 16, respectively, on the other side of the frame cover 21, and second convex sections 213 prepared for on the part corresponding to the raising section 245 shown in FIG. 15, respectively, on the other side of the frame cover 21.

In addition, FIG. 17 shows a concave section 211 which is depressed by one step when seeing from the surface of the frame cover 21, that is, which offers upheaval to this side in FIG. 17 at the center of the other side opposite to the side where the notches 21 b are installed, on the other side of the frame cover 21. The concave section 211 is provided with a hole 211 a into which the tip of the miniature camera described later is inserted. Incidentally, the part of the guide frame 24 shown in FIG. 15 and FIG. 16 is covered with the left side of the frame cover 21 shown in FIG. 17. FIG. 17 further shows screw holes 210 a for installing the frame cover 21 in the back cover 22.

FIG. 18 is a partially enlarged view of the backside of a frame cover. FIG. 19 is a partially enlarged view of the backside of a frame cover.

FIG. 18 shows the appearance in which the frame cover 21 shown in FIG. 17 is seen in the direction of the arrow Y that is shown in FIG. 17. Here, there is shown the first convex section 212 that has slopes 212 a each touching the slope 243 a shown in FIG. 16.

FIG. 19 shows the appearance in which the frame cover 21 shown in FIG. 17 is seen in the direction of the arrow Z that is shown in FIG. 17. Here, there is shown the second convex section 213 that has slopes 213 a each touching the slope 245 a shown in FIG. 15.

FIG. 20 is a sectional view taken along the line X-X′ of FIG. 2.

FIG. 20 shows the appearance in which the slope 212 a of the first convex section 212 shown in FIG. 18 comes in contact with the slope 243 a of the isolation section 243 shown in FIG. 16.

FIG. 20 further shows the appearance in which the touching section 242 of the guide frame 24 touches the back surroundings edge of the image display device 23, and the isolation section 243, which is established on the base section 241, separates the wiring 100 and the image display device 23.

FIG. 20 furthermore shows the appearance in which the wiring restriction section 244 projects from the isolation section 243 to the standing wall 221 of the back cover 22.

According to the present embodiment, the slope 243 a of the isolation section 243 comes in contact with the first convex section 212 of the frame cover 21, and the slope 245 a of the raising section 245 comes in contact with the second convex sections 213 of the frame cover 21. This feature makes it possible to distribute the pressure that applies to the frame cover 21, so that the pressure that reaches the image display device 23 can be weakened.

FIG. 21 is a view of a camera unit which is incorporated in an image display unit.

FIG. 21 shows a camera unit 25, which is disposed to surroundings where the image display device 23 is avoided, in the back cover 22. The camera unit 25 is composed of an image taking lens 251, a barrel 252 of which the image taking lens 251 is set to the front, the barrel 252 incorporating therein an image sensor (not illustrated) on which the subject light passed through the image taking lens 251 is image-formed, a circuit substrate 253 that is loaded with electronic circuits for processing an image signal outputted from the image sensor, and a connector for coupling the circuit substrate 253 and the wiring 100. Incidentally, the front 2521 of the barrel 252, to which the image taking lens 251 is set, is smoothly formed.

FIG. 22 is a partially enlarged view of the frame cover shown in FIG. 13.

FIG. 22 shows the appearance in which the part that covers the camera unit 25 shown in FIG. 21, of the frame cover 21, is seen from the front side.

Moreover, FIG. 22 shows the appearance in which acrylic board 26 is set into the concave section 211 prepared for in the part with which the camera unit 25 is covered, of the frame cover 21, the concave section 211 being dropped-in by one step from surroundings.

The concave section 211 is provided with a hole 211 a through which the tip of barrel 252 of the camera unit 25 is inserted. Moreover, the frame cover 21 shown in FIG. 22 is actually colored to the black. Also regarding the acrylic board 26, only the part that meets the hole 211 a prepared for in the concave section 211 is transparent, and another is colored to the black.

Moreover, FIG. 22 shows screw holes 21 a for fixing the frame cover 21 to the back cover 22, and in addition facing materials 28 to be set in here to conceal the screw holes 21 a after the frame cover 21 is fixed to the back cover 22.

FIG. 23 is a sectional view of the image display unit including a camera unit.

FIG. 23 shows the appearance in which seal material 27 is placed between the front side 2521 of the barrel 252 of the camera unit 25 and the back of the acrylic board 26, the seal material 27 being inserted through the hole 211 a of the concave section 211 of the frame cover 21.

The seal material 27 seals up the image taking lens 251 by a few collapsing between the acrylic board 26 and the barrel 252 when the frame cover 21 is fixed to the back cover 22.

FIG. 24 is a perspective view of the seal member.

As the seal material 27, there is adopted one made of hard rubber shaped as a ring, so as not to cover the image taking lens 251 when collapsing. The seal material 27 is the one whose outside diameter may be completely installed on hole 211 a prepared for in the concave section 211 of the frame cover 21, and whose thickness is thinner than the thickness of the concave section 211.

According to the present embodiment, the dustproof of the image taking lens 251 is implemented in such a way that the seal material 27 is placed between the acrylic board 26 and the barrel 252. This feature makes it possible to contribute to a miniaturization in surroundings of the barrel 252 without decreasing dustproof as compared with a case where the cap that protrudes even to surroundings of the barrel 252 is installed. Incidentally, it is acceptable that the material of the seal material 27 is a material because it only has to be able to secure sealing up as soft as the sponge, but not the one limited to the hard rubber.

Although the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by those embodiments but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and sprit of the present invention. 

1. A heat radiator having two or more heat radiation fins arranged at intervals, which conducts heat from the heat radiation fins to air that flows in space of the heat radiation fins, wherein: the heat radiation fins have notches formed such that central parts of edges of the heat radiation fins in at least one of the air inflow side and the air outflow side of the heat radiation fins are cut alternately or on a circulating basis in an array direction of the heat radiation fins.
 2. The heat radiator according to claim 1, wherein the heat radiator has an endothermic board that absorbs heat generated from a heat generation part to be cooled, and a heat transfer member that transfers the heat of the endothermic board to the heat radiation fins by contacting the endothermic board and piercing through the heat radiation fins.
 3. The heat radiator according to claim 1, wherein the heat radiator has a fan that forms an air stream in a space between the adjacent heat radiation fins.
 4. The heat radiator according to claim 3, wherein the fan is a fan that sends air to the space of the heat radiation fins.
 5. An electronic apparatus comprising: a circuit substrate that is loaded with a processing circuit for executing a program; and a heat radiator that radiates heat of the processing circuit, wherein the heat radiator has: two or more heat radiation fins arranged at intervals, and an endothermic board that absorbs heat generated from a heat generation part to be cooled, and the heat radiation fins have notches formed such that central parts of edges of the heat radiation fins in at least one of the air inflow side and the air outflow side of the heat radiation fins are cut alternately or on a circulating basis in an array direction of the heat radiation fins.
 6. The electronic apparatus according to claim 5, wherein the electronic apparatus has a fan that forms an air stream in a space between the adjacent heat radiation fins.
 7. The electronic apparatus according to claim 6, wherein the fan is a fan that sends air to the space of the heat radiation fins.
 8. The electronic apparatus according to claim 5, further comprising: a first case that incorporates the circuit substrate and the heat radiator, the first case having a keyboard on a top of the first case; and a second case connected to the first case via a hinge, the second case being openable and closable with respect to the first case.
 9. The electronic apparatus according to claim 8, wherein the second case is a display device having a display screen that displays a result of processing by the processing circuit. 